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Thanks - I can see that my question was ambiguous! Those are both reasons for the loco being on the back, and in fact this one did turn round east of Newport. But my question was why was the loco idling rather than switched off.
Saw 45212 at Cardiff yesterday on the Cathedrals express and noticed that the 47 on the back was idling and wondered why - does this assist in any way, or just provide ETS or what? And is this what normally happens on railtours? Just curious...
I saw that the stock off this railtour is due to trundle off to Barry (http://www.realtimetrains.co.uk/train/U52215/2018/03/01/advanced) and return (http://www.realtimetrains.co.uk/train/U52216/2018/03/01/advanced) a bit later. What happens to the loco - will it be turned round somehow in a...